I'm in my hotel room after the final day of Drupalcon San Francisco 2010. As always, I had a great time at the conference. I've been so busy building Acquia Hosting for the last year that I lost track of most of what went on with Drupal development in 2009 (except for the Field API project, of course), and I really enjoyed the opportunity to catch up.
My personal Drupalcon experience was largely focused around two new developments: